Fair Value (Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivative assets
Total derivative assets, gross	$ 609	$ 694
Total derivative asset, netting	(437)	(447)
Derivative liabilities
Total derivative liabilities, gross	(505)	(605)
Total derivative liability, netting	402	430
DTE Electric
Assets
Nuclear decommissioning trusts	2,480	2,256
Current liabilities
Derivative liabilities
Total derivative liabilities, gross	(348)	(441)
Noncurrent liabilities
Derivative liabilities
Total derivative liabilities, gross	(157)	(164)
Natural gas
Derivative assets
Total derivative assets, gross	344	428
Total derivative asset, netting	(255)	(285)
Derivative liabilities
Total derivative liabilities, gross	(300)	(410)
Total derivative liability, netting	230	272
Electricity
Derivative assets
Total derivative assets, gross	191	187
Total derivative asset, netting	(126)	(116)
Derivative liabilities
Total derivative liabilities, gross	(163)	(150)
Total derivative liability, netting	131	114
Environmental & Other
Derivative assets
Total derivative assets, gross	74	58
Total derivative asset, netting	(56)	(46)
Derivative liabilities
Total derivative liabilities, gross	(41)	(44)
Total derivative liability, netting	41	44
Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	31	26
Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	362	349
Hedge funds and similar investments | DTE Electric
Assets
Nuclear decommissioning trusts	241	228
Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	1,139	1,003
Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	707	650
Recurring
Assets
Cash equivalents and Restricted cash	24	11
Derivative assets
Total derivative asset, netting	(437)	(447)
Total derivative assets, net balance	172	247
Total Assets	2,796	2,622
Derivative liabilities
Total derivative liability, netting	402	430
Total Liabilities	(103)	(175)
Net Assets (Liabilities) at end of period	2,693	2,447
Net Assets at end of period, netting	(35)	(17)
Recurring | DTE Electric
Assets
Cash equivalents and Restricted cash	22	8
Derivative assets
Total Assets	2,569	2,318
Recurring | Current assets
Derivative assets
Total derivative asset, netting	(317)	(326)
Total Assets	127	173
Recurring | Current assets | DTE Electric
Derivative assets
Total Assets	40	17
Recurring | Noncurrent assets
Derivative assets
Total derivative asset, netting	(120)	(121)
Total Assets	2,669	2,449
Recurring | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	2,529	2,301
Recurring | Current liabilities
Derivative liabilities
Total derivative liability, netting	300	323
Total Liabilities	(48)	(118)
Recurring | Noncurrent liabilities
Derivative liabilities
Total derivative liability, netting	102	107
Total Liabilities	(55)	(57)
Recurring | Restricted cash
Assets
Cash equivalents and Restricted cash	22	8
Recurring | Natural gas
Derivative assets
Total derivative asset, netting	(255)	(285)
Total derivative assets, net balance	89	143
Derivative liabilities
Total derivative liability, netting	230	272
Total derivative liabilities, net balance	(70)	(138)
Recurring | Electricity
Derivative assets
Total derivative asset, netting	(126)	(116)
Total derivative assets, net balance	65	71
Derivative liabilities
Total derivative liability, netting	131	114
Total derivative liabilities, net balance	(32)	(36)
Recurring | Environmental & Other
Derivative assets
Total derivative asset, netting	(56)	(46)
Total derivative assets, net balance	18	12
Derivative liabilities
Total derivative liability, netting	41	44
Total derivative liabilities, net balance	0	0
Recurring | Other contracts
Derivative assets
Total derivative assets, net balance	0	21
Derivative liabilities
Total derivative liabilities, net balance	(1)	(1)
Recurring | Derivative assets — FTRs | DTE Electric
Derivative assets
Total derivative assets, net balance	18	9
Recurring | Cash equivalents
Assets
Nuclear decommissioning trusts	31	26
Other investments	31	29
Recurring | Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	31	26
Other investments	19	19
Recurring | Private equity and other
Assets
Nuclear decommissioning trusts	362	349
Recurring | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	362	349
Recurring | Hedge funds and similar investments
Assets
Nuclear decommissioning trusts	241	228
Recurring | Hedge funds and similar investments | DTE Electric
Assets
Nuclear decommissioning trusts	241	228
Recurring | Equity securities
Assets
Nuclear decommissioning trusts	1,139	1,003
Other investments	81	72
Recurring | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	1,139	1,003
Other investments	30	26
Recurring | Fixed income securities
Assets
Nuclear decommissioning trusts	707	650
Other investments	8	7
Recurring | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	707	650
Recurring | Level 1
Assets
Cash equivalents and Restricted cash	24	11
Derivative assets
Total derivative assets, gross	307	310
Total Assets	1,802	1,602
Derivative liabilities
Total Liabilities	(288)	(290)
Net Assets (Liabilities) at end of period	1,514	1,312
Recurring | Level 1 | DTE Electric
Assets
Cash equivalents and Restricted cash	22	8
Derivative assets
Total Assets	1,422	1,226
Recurring | Level 1 | Current assets
Derivative assets
Total Assets	255	223
Recurring | Level 1 | Current assets | DTE Electric
Derivative assets
Total Assets	22	8
Recurring | Level 1 | Noncurrent assets
Derivative assets
Total Assets	1,547	1,379
Recurring | Level 1 | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	1,400	1,218
Recurring | Level 1 | Current liabilities
Derivative liabilities
Total Liabilities	(219)	(219)
Recurring | Level 1 | Noncurrent liabilities
Derivative liabilities
Total Liabilities	(69)	(71)
Recurring | Level 1 | Natural gas
Derivative assets
Total derivative assets, gross	215	242
Derivative liabilities
Total derivative liabilities, gross	(190)	(217)
Recurring | Level 1 | Electricity
Derivative assets
Total derivative assets, gross	80	67
Derivative liabilities
Total derivative liabilities, gross	(86)	(71)
Recurring | Level 1 | Environmental & Other
Derivative assets
Total derivative assets, gross	12	1
Derivative liabilities
Total derivative liabilities, gross	(12)	(2)
Recurring | Level 1 | Other contracts
Derivative assets
Total derivative assets, gross	0	0
Derivative liabilities
Total derivative liabilities, gross	0	0
Recurring | Level 1 | Derivative assets — FTRs | DTE Electric
Derivative assets
Total derivative assets, net balance	0	0
Recurring | Level 1 | Cash equivalents
Assets
Nuclear decommissioning trusts	31	26
Other investments	31	29
Recurring | Level 1 | Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	31	26
Other investments	19	19
Recurring | Level 1 | Private equity and other
Assets
Nuclear decommissioning trusts	8	16
Recurring | Level 1 | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	8	16
Recurring | Level 1 | Hedge funds and similar investments
Assets
Nuclear decommissioning trusts	225	151
Recurring | Level 1 | Hedge funds and similar investments | DTE Electric
Assets
Nuclear decommissioning trusts	225	151
Recurring | Level 1 | Equity securities
Assets
Nuclear decommissioning trusts	958	856
Other investments	81	72
Recurring | Level 1 | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	958	856
Other investments	30	26
Recurring | Level 1 | Fixed income securities
Assets
Nuclear decommissioning trusts	129	124
Other investments	8	7
Recurring | Level 1 | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	129	124
Recurring | Level 2
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total derivative assets, gross	149	218
Total Assets	617	648
Derivative liabilities
Total Liabilities	(107)	(162)
Net Assets (Liabilities) at end of period	510	486
Recurring | Level 2 | DTE Electric
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total Assets	468	430
Recurring | Level 2 | Current assets
Derivative assets
Total Assets	97	170
Recurring | Level 2 | Current assets | DTE Electric
Derivative assets
Total Assets	0	0
Recurring | Level 2 | Noncurrent assets
Derivative assets
Total Assets	520	478
Recurring | Level 2 | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	468	430
Recurring | Level 2 | Current liabilities
Derivative liabilities
Total Liabilities	(74)	(129)
Recurring | Level 2 | Noncurrent liabilities
Derivative liabilities
Total Liabilities	(33)	(33)
Recurring | Level 2 | Natural gas
Derivative assets
Total derivative assets, gross	30	81
Derivative liabilities
Total derivative liabilities, gross	(30)	(70)
Recurring | Level 2 | Electricity
Derivative assets
Total derivative assets, gross	76	69
Derivative liabilities
Total derivative liabilities, gross	(47)	(52)
Recurring | Level 2 | Environmental & Other
Derivative assets
Total derivative assets, gross	43	47
Derivative liabilities
Total derivative liabilities, gross	(29)	(39)
Recurring | Level 2 | Other contracts
Derivative assets
Total derivative assets, gross	0	21
Derivative liabilities
Total derivative liabilities, gross	(1)	(1)
Recurring | Level 2 | Derivative assets — FTRs | DTE Electric
Derivative assets
Total derivative assets, net balance	0	0
Recurring | Level 2 | Cash equivalents
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 2 | Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 2 | Private equity and other
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 2 | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 2 | Hedge funds and similar investments
Assets
Nuclear decommissioning trusts	16	16
Recurring | Level 2 | Hedge funds and similar investments | DTE Electric
Assets
Nuclear decommissioning trusts	16	16
Recurring | Level 2 | Equity securities
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 2 | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 2 | Fixed income securities
Assets
Nuclear decommissioning trusts	452	414
Other investments	0	0
Recurring | Level 2 | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	452	414
Recurring | Level 3
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total derivative assets, gross	153	166
Total Assets	153	166
Derivative liabilities
Total Liabilities	(110)	(153)
Net Assets (Liabilities) at end of period	43	13
Recurring | Level 3 | DTE Electric
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total Assets	18	9
Recurring | Level 3 | Current assets
Derivative assets
Total Assets	92	106
Recurring | Level 3 | Current assets | DTE Electric
Derivative assets
Total Assets	18	9
Recurring | Level 3 | Noncurrent assets
Derivative assets
Total Assets	61	60
Recurring | Level 3 | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	0	0
Recurring | Level 3 | Current liabilities
Derivative liabilities
Total Liabilities	(55)	(93)
Recurring | Level 3 | Noncurrent liabilities
Derivative liabilities
Total Liabilities	(55)	(60)
Recurring | Level 3 | Natural gas
Derivative assets
Total derivative assets, gross	99	105
Derivative liabilities
Total derivative liabilities, gross	(80)	(123)
Recurring | Level 3 | Electricity
Derivative assets
Total derivative assets, gross	35	51
Derivative liabilities
Total derivative liabilities, gross	(30)	(27)
Recurring | Level 3 | Environmental & Other
Derivative assets
Total derivative assets, gross	19	10
Derivative liabilities
Total derivative liabilities, gross	0	(3)
Recurring | Level 3 | Other contracts
Derivative assets
Total derivative assets, gross	0	0
Derivative liabilities
Total derivative liabilities, gross	0	0
Recurring | Level 3 | Derivative assets — FTRs | DTE Electric
Derivative assets
Total derivative assets, net balance	18	9
Recurring | Level 3 | Cash equivalents
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Private equity and other
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 3 | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 3 | Hedge funds and similar investments
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 3 | Hedge funds and similar investments | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Recurring | Level 3 | Equity securities
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Fixed income securities
Assets
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	0	0
Recurring | Other
Derivative assets
Total Assets	661	653
Derivative liabilities
Net Assets (Liabilities) at end of period	661	653
Recurring | Other | DTE Electric
Derivative assets
Total Assets	661	653
Recurring | Other | Noncurrent assets
Derivative assets
Total Assets	661	653
Recurring | Other | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	661	653
Recurring | Other | Private equity and other
Assets
Nuclear decommissioning trusts	354	333
Recurring | Other | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	354	333
Recurring | Other | Hedge funds and similar investments
Assets
Nuclear decommissioning trusts	0	61
Recurring | Other | Hedge funds and similar investments | DTE Electric
Assets
Nuclear decommissioning trusts	0	61
Recurring | Other | Equity securities
Assets
Nuclear decommissioning trusts	181	147
Recurring | Other | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	181	147
Recurring | Other | Fixed income securities
Assets
Nuclear decommissioning trusts	126	112
Recurring | Other | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	$ 126	$ 112